The bank, which was slapped with a huge fine last week for manipulating interbank lending rates, announced the resignation of Chief Executive Robert Diamond. Chairman Marcus Agius, who had stepped down Monday, will reassume his post at the head of the board to help search for a new CEO.

Shares spent much of the day climbing on that news until a later announcement that Chief Operating Officer Jerry del Missier had also quit.

Analysts at Daniel Stewart & Co. said Barclays will have difficulty replacing Diamond and it will be harder to reach growth and return-on-equity targets. “At the very least, there will be a hiatus period,” the analysts said.

They also said the Libor-manipulation scandal was not confined to Barclays and investors now will be wondering who among the senior executives in other U.K. banks and overseas institutions are at risk of being pushed out. Read ‘Period of remorse’ catches up to Diamond.

Other banks were mixed. Standard Chartered PLC (STAN) rose 2%.

Mining stocks were also in the black as metals prices pushed higher across the board.

On the downside, energy major BP PLC (BP.) eked out a 0.1% gain to 432.9 pence, erasing an earlier loss scored after Deutsche Bank cut its target price for the group to 500 pence from 525 pence. That came as the analysts cut their 2012-15 Brent crude forecasts by an average of 11%, but retained a buy rating on BP.

Shares of Tullow Oil PLC (TLW) rose 2.5% and BG Group PLC (BG.) rose 1.8%. BG Group’s price target was also trimmed at Deutsche Bank, but the analysts kept a buy rating on it as well.

Shares of Aberdeen Asset Management PLC (ADN) dropped 3.7% after Credit Suisse sold a 7% stake of the fund manager in order to help bolster capital. The sale came at the close of Monday’s trade, said a spokesman for Aberdeen.

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